<ion-app>
  <ion-header>
    <ion-toolbar>
      <ion-buttons slot="start">
        <ion-back-button defaultHref="/home" text="Back" color="primary"></ion-back-button>
      </ion-buttons>
      <ion-title>Device-Orientation</ion-title>
    </ion-toolbar>
  </ion-header>

  <ion-content class="ion-padding">
    <ion-grid>
      <ion-row>
        <ion-col>
          {{headingDegrees }}
        </ion-col>
        <ion-col>
          {{headingSymbol}}
        </ion-col>

      </ion-row>
    </ion-grid>
  </ion-content>

</ion-app>
